if you want to protect yourself from any future discussion on the matter, you can mention "no watermarks/signatures " in the rules - but yes, in my understanding the exclusion of watermarks does include signatures. Or should that be: the exclusion of watermarks includes the exclusion of signatures?

I updated all the others yesterday to say just that. This is the first time it has come up and the person was a real pain about it. I DQ'ed it and he put it back, I DQ'ed it again and he put it back... Always saying why. 4 attempts and 4 emails later he reluctantly got it.
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It's easier to ask for forgiveness then to ask for permission.